<template>
  <a-upload
    v-model:file-list="fileList"
    name="avatar"
    list-type="picture-card"
    class="avatar-uploader"
    :show-upload-list="false"
    :before-upload="beforeUpload"
    @change="handleChange"
  >
    <img v-if="imageUrl" :src="imageUrl" alt="avatar" />
    <div v-else>
      <loading-outlined v-if="loading"></loading-outlined>
      <plus-outlined v-else></plus-outlined>
      <div class="ant-upload-text">Upload</div>
    </div>
  </a-upload>
</template>

<script>
import { PlusOutlined, LoadingOutlined } from "@ant-design/icons-vue";
import { message } from "ant-design-vue";
import { ref } from "vue";

function getBase64(img, callback) {
  const reader = new FileReader();
  reader.addEventListener("load", () => callback(reader.result));
  reader.readAsDataURL(img);
}

export default {
  components: {
    LoadingOutlined,
    PlusOutlined,
  },

  setup() {
    const fileList = ref([]);
    const loading = ref(false);
    const imageUrl = ref("");

    const handleChange = (info) => {
      if (info.file.status === "uploading") {
        loading.value = true;
        return;
      }

      if (info.file.status === "done") {
        // Get this url from response in real world.
        getBase64(info.file.originFileObj, (base64Url) => {
          imageUrl.value = base64Url;
          loading.value = false;
        });
      }

      if (info.file.status === "error") {
        loading.value = false;
        message.error("upload error");
      }
    };

    // const beforeUpload = (file) => {
    //   const isJpgOrPng =
    //     file.type === "image/jpeg" || file.type === "image/png";

    //   if (!isJpgOrPng) {
    //     message.error("你应该上传图片文件");
    //   }

    //   const isLt2M = file.size / 1024 / 1024 < 2;

    //   if (!isLt2M) {
    //     message.error("图片大小应该小于2mb");
    //   }

    //   return isJpgOrPng && isLt2M;
    // };
    const beforeUpload = file => {
      fileList.value = [...fileList.value, file];
      return false;
    };

    return {
      fileList,
      loading,
      imageUrl,
      handleChange,
      beforeUpload,
    };
  },
};
</script>

<style>
.avatar-uploader > .ant-upload {
  width: 128px;
  height: 128px;
}
.ant-upload-select-picture-card i {
  font-size: 32px;
  color: #999;
}

.ant-upload-select-picture-card .ant-upload-text {
  margin-top: 8px;
  color: #666;
}
</style>